This Giveaway is Exclusive for Our Readers and new Readers. It's not Coorporate with LinkedIn. I just want giving away this credit for my readers and new readers. If you often use linkedin, of course it will be useful for you. Giveaway Will ends on January 13rd, 2012. 2 Winners will each win Coupon Credit of LinkedIn Ads $100 Advertising Credit. Share it will your friends and your connections :)

About LinkedIn

Quoted from Wikipedia, LinkedIn is a business-related social networking site. Founded in December 2002 and launched in May 2003, it is mainly used for professional networking. With 135 million users, LinkedIn is ahead of its competitors Viadeo (35 million)and XING (10 million).The membership grows by approximately two new members every second.About half of the members are in the United States and 11 million are from Europe. With 3 million users, India has the fastest-growing network of users as of 2009. The Netherlands has the highest adoption rate per capita outside the US at 30%. LinkedIn recently reached 4 million users in UK, 1 million in Spain, and nearly 1 million in Pakistan.

One purpose of the site is to allow registered users to maintain a list of contact details of people with whom they have some level of relationship, called Connections. Users can invite anyone (whether a site user or not) to become a connection. However, if the invitee selects "I don't know" or "Spam", this counts against the inviter. If the inviter gets too many of such responses, the account may be restricted or closed.
This list of connections can then be used in a number of ways:

A contact network is built up consisting of their direct connections, the connections of each of their connections (termed second-degree connections) and also the connections of second-degree connections (termed third-degree connections). This can be used to gain an introduction to someone a person wishes to know through a mutual contact.

It can then be used to find jobs, people and business opportunities recommended by someone in one's contact network.

Employers can list jobs and search for potential candidates.

Job seekers can review the profile of hiring managers and discover which of their existing contacts can introduce them.

Users can post their own photos and view photos of others to aid in identification.

Users can now follow different companies and can get notification about the new joining and offers available.

Users can save (i.e. bookmark) jobs which they would like to apply for.

The "gated-access approach" (where contact with any professional requires either a preexisting relationship, or the intervention of a contact of theirs) is intended to build trust among the service's users. LinkedIn participates in the EU's International Safe Harbor Privacy Principles.

The feature LinkedIn Answers, similar to Yahoo! Answers, allows users to ask questions for the community to answer. This feature is free and the main difference from the latter is that questions are potentially more business-oriented, and the identity of the people asking and answering questions is known.
Another LinkedIn feature is LinkedIn Polls. In December 2011, LinkedIn announced that they are rolling out polls to their one million groups.

In mid-2008, LinkedIn launched LinkedIn DirectAds as a form of sponsored advertising. In October 2008, LinkedIn revealed plans to opening its social network of 30 million professionals globally as a potential sample for business-to-business research. It is testing a potential social-network revenue model-research that to some appears more promising than advertising.

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